4 C.F.R. § 28.49

Return of service

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When service of a subpoena is effected by a person other than a United States Marshal or Deputy Marshal, that person shall certify on the return of service that service was made either:

(a) In person,

(b) By registered or certified mail, or

(c) By delivery to a responsible person (named) at the residence or place of business (as appropriate) of the person to be served.